Commutator for electric apparatus.



No. 879.246. PATENTED FEB. 18, 1908.

F. W. COX. GOMMUTATOR FOR ELECTRIC APPARATUS.

APPLICATION FILED APR.4, 1906.

INVENTOR I ATTORNEY extremity of the bushing,

UNITED STATES PATENT FREDERICK W. COX, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

COMMUTATOR FOR ELECTRIC APPARATUS.

Specification of Letters Patent.

Patented Feb. 1e, 1908.

Application filed Aprili. 1906. smart. 309.902.

To all whom it may concern:

Be it known that I, Fnnnnnron W. Cox, a citizen of the United States, and a resident of VVilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Commutators for Electric Apparatus, of which the following is a specification.

My invention relates to commutators for dynamo-electric machines and it has for its object to provide improved means for securing and supporting the segments of relatively long commutators such .as are subj ected to high speed operation.

Commutators for dynamo electric machines, as heretofore constructed, have usually comprised a plurality of bars or segments, a bushing having an annular V- shaped projection at one end which was stationary relative thereto and an adjustable clamping ring near itsother extremity. The clam ing rings, which were forced toward see other by any convenient means, such as a nut, screw-threaded onto the outer or clamping bolts which passed through oles in the rings, were adapted to engage complementary notches in the commutator segments. If

this construction is used for very long commutator's, such as are required for machines which'are adapted to receive or to deliver relatively large values of electric current, the commutator segments show a tendency to bulge outwardly in the middle by reason of the centrifugal forces to whichthey are sub- 'ected, articularly in high s eed operation.

his diculty hasbeen avoided in some instances by fastening a rim around the middle of the outer surface 0 the commutator but such a ring diminishes the surface of the commutator which is available for engagement with brushes or current collectors and must be insulated from the commutator segments.

According to my present invention I fasten the commutator segments securel in position without the use of anexterna ring and employ a supporting bushing which issimi- I justab and a clamping sleeve 6, which is adjustabiy mounted near the other end of the bushing 1, is adapted to engage the notches 4 in the segments. The sleeve 6 may be adjusted by means of a nut 7 which is screw-threaded onto the outer end of the bushing 1 and serves to force the stationary and movable clamping rings toward each other. The

outer ends of the segments 3 are beveled and are en aged by a clamping ring 8 which is adly mounted upon the sleeve 6 and which may be adjusted by means of a nut 9 that is screw-threaded onto the outer end of the sleeve. The commutator segments of Fig. 2 are provided. with projections 10 at their inner ends which are beveled and which may be engaged by a clamping ring 1 l. The clamping ring 11 is attached to the inner end of the bushing 1 by any convenient means, such as bolts 12.

The arrangement shown in Fig. .3 is similar to that of Figs. 1 and 2 except that the beveled end projections 1d of the commutator bars are engaged by an annular projection 13 near the inner end of the bushmg 1 which corresponds to the projection 2 of the other figures. By making the notches 4 near the middle of the segments and making the sleeve 6 of considerable length, the commutator segments. may be securely held in osition irres ective of their length and of tfie speed at w 'ch the commutator is operated. I

The supporting means illustrated is specially advantageous in that the adjustment of the movable clamping rings may readily be effected from the outer end of the commutator and in that'the entire construction is relatively sim le and durable.

Although specific arrangement I desire that only such limitations be imposed as are indicated in the appended claims.

1 claim as my invention: I

l. in a commutator, the combination with a single set of unitary segments, and a support therefor having an integral clamping The notches 5 are engaged by the have shown and described a beveled outer ends, and a likaymg an integral clamping ring, of a -ad-' J ringat one end, ofa main adjustable clam ing ring and a supplemental adjustab e clam ing ring mounted upon the main adjusta le ring.

2. In a commutator, the combination With a single set of unitary segments having beveled outer ends, and a support therefor, of an adjustable clamping sleeve which engages a notch near the middle of the segments, and a clamping ring adjustably mounted on the sleeve to engage the beveled ends of the segments.

3. In a commutator, the combination with a single set of unitary segments having support therefor stable clamping sleeve which engages not es near the middle of the segments, and

beveled ends and a su ort havin an integral clampingring near its inner end Which engages notches in the segments, of an adjustable clamping sleeve mounted on the support, and an. adjustable clamping ring mounted on the sleeve to engage the beveled. ends of the segments. I

In testimony whereof, I have hereunto subscribedmyname this 28th day of March. 1906.

- FREDERICK W. COX. ll/HRQ QQI C. B. AUEL, BIRNEY HINEs. 

